Overview
Waimanalo WWTF serves 8,200 people in Waimanalo Beach, Hawaii. The plant operates under the US Clean Water Act, treating wastewater for a coastal community on Oahu's eastern shore.
Waimanalo WWTF is a municipal wastewater treatment facility located in Waimanalo Beach on the island of Oahu, Hawaii. Serving a population of approximately 8,200, the plant is part of the wastewater infrastructure managed by Honolulu County. The facility is situated near the coast, reflecting the community's reliance on effective wastewater management to protect nearshore waters. As a US-based plant serving a medium-sized agglomeration, Waimanalo WWTF is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting. These regulations require secondary treatment as a baseline, with additional nutrient removal where necessary to protect sensitive water bodies. The plant's treatment processes are designed to meet state and federal standards for effluent quality. The treated effluent from Waimanalo WWTF likely discharges into nearshore waters of the Pacific Ocean, which support diverse marine life including coral reefs and fish populations. The plant plays a critical role in safeguarding coastal water quality and the ecological health of Oahu's southeastern shoreline, which is important for recreation and native Hawaiian cultural practices.
Environmental context
Waimanalo WWTF discharges into the Pacific Ocean along Oahu's windward coast. The nearshore environment includes fringing coral reefs and seagrass beds that support diverse marine species. Effective wastewater treatment is essential to prevent nutrient pollution and protect these sensitive ecosystems, which are vital for local fisheries and tourism.
Frequently asked questions
Waimanalo WWTF is located in Waimanalo Beach, on the island of Oahu in Honolulu County, Hawaii, United States.
The plant serves approximately 8,200 people in the Waimanalo Beach community.
The treated effluent is discharged into nearshore waters of the Pacific Ocean, likely through an ocean outfall, following treatment that meets Clean Water Act standards.
As a US facility, Waimanalo WWTF operates under the Clean Water Act and is required to have an NPDES permit issued by the Hawaii Department of Health, which sets effluent limits to protect water quality.
Plants of this scale typically employ secondary treatment, such as activated sludge or trickling filters, to meet EPA standards. Some may include disinfection and nutrient removal depending on local discharge requirements.
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